A perfect
result is a single spectrogram trace with no spurious generated
tones (completely black background). See
this
page for comparisons with other SRCs.

RIAA
Correction Curve Accuracy

Measurement
Conditions: Sample Rate 192 kHz / Resolution 24 bit

+0.06,
-0.00 dB, 20 Hz - 10 kHz(+0.01, -0.00 dB, from 20 Hz
- 3 kHz)

Rising
gradually to <+0.2 dB at 20 kHzand
+1.0 dB at 50 kHz*

Interchannel
Amplitude Deviation: 0 dB

Interchannel
Phase Deviation: 0 degrees

*The
response rise at high frequencies represents a deliberate compromise
between the standard RIAA curve and the newer, "modified"
RIAA curve, which calls for an additional compensation filter
"corner frequency" (amounting to +3 dB at 50 kHz) to
compensate for vinyl cutter head rolloff. We have taken a moderate
approach (+1 rather than +3 dB at 50 kHz and +0.175 instead of
+0.6 dB at 20 kHz).